通过创建线程实现生产者、消费者对缓冲区进行互斥操作。

用信号量机制解决进程(线程)的同步与互斥问题。

缓冲区大小为31，缓冲区满则不允许生产者生产数据，缓冲区空则不允许消费者消费数据。

程序一直运行下去，直到敲击回车停止。-Achieved by creating a thread producers, consumers mutually exclusive operation of the buffer. Settlement process with the semaphore mechanism (thread) synchronization and mutual exclusion issues. Buffer size is 31, the buffer is full, do not allow producers to production data, the buffer space is not allowed consumer spending data. Program has been run down, until hit Enter to stop.